sic.c

   1  /* See LICENSE file for license details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <stdarg.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <time.h>
   9 #include <unistd.h>
  10
  11 static char *host = "irc.oftc.net";
  12 static char *port = "ircd";
  13 static char *password;
  14 static char nick[32];
  15 static char bufin[4096];
  16 static char bufout[4096];
  17 static char channel[256];
  18 static time_t trespond;
  19 static FILE *srv;
  20
  21 #include "util.c"
  22
  23 static void
  24 pout(char *channel, char *fmt, ...) {
  25         static char timestr[18];
  26         time_t t;
  27         va_list ap;
  28
  29         va_start(ap, fmt);
  30         vsnprintf(bufout, sizeof bufout, fmt, ap);
  31         va_end(ap);
  32         t = time(NULL);
  33         strftime(timestr, sizeof timestr, "%D %R", localtime(&t));
  34         fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
  35 }
  36
  37 static void
  38 sout(char *fmt, ...) {
  39         va_list ap;
  40
  41         va_start(ap, fmt);
  42         vsnprintf(bufout, sizeof bufout, fmt, ap);
  43         va_end(ap);
  44         fprintf(srv, "%s\r\n", bufout);
  45         fprintf(stderr, "debug: %s\n", bufout);
  46 }
  47
  48 static void
  49 privmsg(char *channel, char *msg) {
  50         if(channel[0] == '\0') {
  51                 pout("", "No channel to send to");
  52                 return;
  53         }
  54         pout(channel, "<%s> %s", nick, msg);
  55         sout("PRIVMSG %s :%s", channel, msg);
  56 }
  57
  58 static void
  59 parsein(char *msg) {
  60         char *p;
  61         char c;
  62
  63         if(msg[0] == '\0')
  64                 return;
  65         msg = ctok(&msg, '\n');
  66         if(msg[0] != ':') {
  67                 privmsg(channel, msg);
  68                 return;
  69         }
  70         c = *++msg;
  71         if(!c || !isspace(msg[1]))
  72                 sout("%s", msg);
  73         else {
  74                 if(msg[1])
  75                         msg += 2;
  76                 switch(c) {
  77                 case 'j':
  78                         sout("JOIN %s", msg);
  79                         if(channel[0] == '\0')
  80                                 strlcpy(channel, msg, sizeof channel);
  81                         break;
  82                 case 'l':
  83                         p = tok(&msg);
  84                         if(!*p)
  85                                 p = channel;
  86                         if(!*msg)
  87                                 msg = "sic - 250 LOC are too much!";
  88                         sout("PART %s :%s", p, msg);
  89                         break;
  90                 case 'm':
  91                         p = tok(&msg);
  92                         privmsg(p, msg);
  93                         break;
  94                 case 's':
  95                         strlcpy(channel, msg, sizeof channel);
  96                         break;
  97                 default:
  98                         sout("%c %s", c, msg);
  99                         break;
 100                 }
 101         }
 102 }
 103
 104 static void
 105 parsesrv(char *msg) {
 106         char *cmd, *p, *usr, *txt;
 107
 108         usr = host;
 109         if(!msg || !*msg)
 110                 return;
 111         if(msg[0] == ':') {
 112                 msg++;
 113                 p = tok(&msg);
 114                 if(!*msg)
 115                         return;
 116                 usr = ctok(&p, '!');
 117         }
 118         txt = ctok(&msg, '\r');
 119         msg = ctok(&txt, ':');
 120         cmd = tok(&msg);
 121         if(!strcmp("PONG", cmd))
 122                 return;
 123         if(!strcmp("PRIVMSG", cmd))
 124                 pout(msg, "<%s> %s", usr, txt);
 125         else if(!strcmp("PING", cmd))
 126                 sout("PONG %s", txt);
 127         else {
 128                 pout(usr, ">< %s: %s", cmd, txt);
 129                 if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
 130                         strlcpy(nick, txt, sizeof nick);
 131         }
 132 }
 133
 134 int
 135 main(int argc, char *argv[]) {
 136         int i, c;
 137         struct timeval tv;
 138         fd_set rd;
 139
 140         strlcpy(nick, getenv("USER"), sizeof nick);
 141         for(i = 1; i < argc; i++) {
 142                 c = argv[i][1];
 143                 if(argv[i][0] != '-' || argv[i][2])
 144                         c = -1;
 145                 switch(c) {
 146                 case 'h':
 147                         if(++i < argc) host = argv[i];
 148                         break;
 149                 case 'p':
 150                         if(++i < argc) port = argv[i];
 151                         break;
 152                 case 'n':
 153                         if(++i < argc) strlcpy(nick, argv[i], sizeof nick);
 154                         break;
 155                 case 'k':
 156                         if(++i < argc) password = argv[i];
 157                         break;
 158                 case 'v':
 159                         eprint("sic-"VERSION", © 2005-2009 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
 160                 default:
 161                         eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n");
 162                 }
 163         }
 164         /* init */
 165         i = dial(host, port);
 166         srv = fdopen(i, "r+");
 167         /* login */
 168         if(password)
 169                 sout("PASS %s", password);
 170         sout("NICK %s", nick);
 171         sout("USER %s localhost %s :%s", nick, host, nick);
 172         fflush(srv);
 173         setbuf(stdout, NULL);
 174         setbuf(srv, NULL);
 175         for(;;) { /* main loop */
 176                 FD_ZERO(&rd);
 177                 FD_SET(0, &rd);
 178                 FD_SET(fileno(srv), &rd);
 179                 tv.tv_sec = 120;
 180                 tv.tv_usec = 0;
 181                 i = select(fileno(srv) + 1, &rd, 0, 0, &tv);
 182                 if(i < 0) {
 183                         if(errno == EINTR)
 184                                 continue;
 185                         eprint("sic: error on select():");
 186                 }
 187                 else if(i == 0) {
 188                         if(time(NULL) - trespond >= 300)
 189                                 eprint("sic shutting down: parse timeout\n");
 190                         sout("PING %s", host);
 191                         continue;
 192                 }
 193                 if(FD_ISSET(fileno(srv), &rd)) {
 194                         if(fgets(bufin, sizeof bufin, srv) == NULL)
 195                                 eprint("sic: remote host closed connection\n");
 196                         parsesrv(bufin);
 197                         trespond = time(NULL);
 198                 }
 199                 if(FD_ISSET(0, &rd)) {
 200                         if(fgets(bufin, sizeof bufin, stdin) == NULL)
 201                                 eprint("sic: broken pipe\n");
 202                         parsein(bufin);
 203                 }
 204         }
 205         return 0;
 206 }